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Finding the Fourth Proportional to 20,919.92, 28,870.08 and 11,489.09

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Solution

The fourth proportional to 20,919.92, 28,870.08 and 11,489.09 is: 15,855.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.92 : 28,870.08 = 11,489.09 : x
  2. Step 2: Convert to fraction form
    20,919.92/28,870.08 = 11,489.09/x
  3. Step 3: Cross multiply
    20,919.92x = 28,870.08 × 11,489.09
  4. Step 4: Simplify right side
    20,919.92x = 331,690,947.43
  5. Step 5: Solve for x
    x = 331,690,947.43/20,919.92
  6. Step 6: Final answer
    x = 15,855.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.